Signal system.



G. S. WILLIAMSON.

SIGNAL SYSTEM. APPLICATION FILED AUG. 23, 1912;

' Patented May 27, .19 3.

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f? v 5/ 58 a? 29 28 27 2 d I2 I?) n u I WITNESSES INVENTOR GsuuuamwmATTORNEY.

G. S. WILLIAMSON SIGNAL SYSTEM. APPLICATION FILED AUG. 23, 19 12.

Patented May 27, 1913.

2 SHEETS-SHEET Z.

INVENTOR a anti/ m $04.

"16mins 4 v w/ g m 1 ill: i 6 Ow 9 m 00 n w w v U NITED STATES ATENTorsrou.

GEORGES. WILLIAMSON, or mexnusronr, PENNSYLVANIA, AsSIGNoR or ONE-THIRD'ro ALBERT r. OHNSTON, or ntcxnnsron'r, PENNSYLVANIA.

SIG AL SYSTEM.

Specification of Letters Patent. I Application filed August 28, 1912'.Serial No. 716,758.

. Patented Ma 27, 1913.

which the following is a, specification,'refer-- ence being had thereinto the accompanying drawing.

This invention; relates .to a signal system especially designed formunicipal use as a combined telephone, telegraphand alarm apparatus suchas ordinarily used in connection with police and fire departments.

My invention aims to provide, first, a noninterferingfire and policealarm system that permits of a talking circdit being maintained fromwhich alarms or signals can be sent without interfering with call boxesthroughout the system. Second, a system that can be usedin connectionwith the present type of fire alarm boxes by proyiding boxes with aswitch released when the door of the fire alarm box is opened. Third,

a system wherein a repeater coil is utilized formaintaining separate andindependent telephone and telegraph circuits-that are cut in on a mainline circuit by anovel switch.

Fourth, a; Signal system that obviates the necessity of maintainingseparate telephone and'telegraph stations throughout a clty1ndependently ofjrhe fire alarm system. Fifth,

a signal system that can be used in connection with the present streetwlrlng of the fire alarm system for maintaining a closed talking circuitvhen boxes are'not in use.

My invention further aims to accomplish the above results by amechanical construction that will be hereinafter specifically describedand then claimed.

Reference will now be had to the drawings wherein there is illustrated apreferred embodiment of my invention, but it is to be understood thatthestructural elements are susccptible to such changes in form, proponionand minor details as fall within the scope ofthe appended claim.

In the drawings: Figure 1 is a diagrammatic view of the electriccircuits used in connection with the system, Fig. 2 is 21- diagrammaticelevation of a repeater coil forming part of the apparatus, and Figs. 3to 6 inclusive are detail views of an alarm mechanism used in connectionwith a fire alarm call box. I As heretofore stated, the signal systemand the apparatus employed for producing the same call, boxes thereforeI have deemed it unnecessary to illustrate but have illustrated in Figs.to 6 inclusive an alarm mechanism that can be operated is applicable todifferent types of '60 a casing of a box,

or pulled to send in an alarm. The mocha-.1-

nism includes a train of gear wheels 1 actu .65 ated by a spring-2 thatis placed in opera- -t1on orunder tension by a pull lever 3. The

train of gears places in motion an alarm tra-ted-in Fig. 3 as 444. Thealarm wheel wheel; 4, containing a call wliich is illusestablishes acircuit througji leading out]? wires 5V and 6, which illustrated inFig. 1. The leading out wire" 5 is connected to an electromagnet 7having a spring actuated striking armature 8 that are diagrammaticallyrepeats the alarm in connection with abell 9.- The electro-magn'et 7 andthe leading out wire 6 are connected to repeater coils 10 and 1-1 of 45ohms respectively. The reeater coil 10 is connected by wires 12 and 13to contacts 14 and 15 respectively and the rep'eatet' coil 11 isconnected by wires 16 and 17 to contacts 18 and 19 respectively.

Associated with these contacts are contacts I 20, 21, 22 and 23, thecontacts 20 and23 being connected by a wire 24 and the contacts 21 and22 by a wire 25.

The contacts 20 to 23 inclusive are nor mally. engaged by pivotedcontact arms 26, 27, 28 and 29 coupled together by a bar 30 whereby allof said arms can move in unison-. The pivoted contact arms 26 to 29inelusive constitute a switch and saidswitch is thrown in engagementwith contacts 14, 15,

18 and 19 by a coiled retractile spring 31 connected to one of saidarms. Toretain the arms 26 to 29 inclusive normally in en-' gagementwith the contacts 20 to 23 inelusive a projection or pin 32 on the innerside of a box door 33 enga' s one of the arms and holds the switch in te position shown.

in- Fig. 1 until the door of the call box is opened, at which time theswitch .is automatically thrown. The contact arms 28 and 29' areconnected to main line wires 34 and 35 respectively having a repeatercoil 36 one half of which is grounded, as at 37. The

contact.- arms 26 and 27 are connectedto' are in circuit with a repeatercoil 40 and one-half of this coil is in circuit with a local battery 41,an alarm bell 42 and a ground 43. The repeater coil can be in circuitthrough the medium a main ofiice telephone.

Connected to the repeater coil 11 are wires 46 and 47, the latter beingconnected to a telephone receiver 48 which is connected by a wire 49 toa coil 50. The coil 5 0,is in cir' cuit with a transmitter 51, a localbattery 52 and a switch arm 53,which is connected to the wire 46. Thecoil is also connected by wires 54 and 55 to contacts 56 of the switcharm 55. This'telephone apparatus is of the ordinary type used 1n policecall boxes and is associated with the alarm mechanism whereby a talkingcircuit can be used dur ing the sending of an alarmlto headquarters.By-reference to Fig. 1 it will be observed that the position of theswitch arms 26 to 29 inclusive maintains the circuit through the mainline wires 34,35, 38 and 39 by reason of the wires 24 and 25,consequently the talking circuit through these wires is not interferedwith by the call box being closed or inactive. r

It is thought that other circuits ofthe apparatus will be apparentwithout further description and that the operation will be understoodwithout specifically tracing the circuits.

*What I claim is In a non-interfering alarm system, two

of wires 44 and 45 with pairs of contacts, a pair of deading-out wires,a magnet interposed in one of said leading-out wires, a repeater coil offortyfive ohms connected to each of said wires,

an alarm mechanism for establishing a cir- 1' cuit through said Wires, apair of-circuit wires leading from each pair of contacts to a coil, arow of contacts arranged with the outer contacts of the 'row connectedtogether and the inner contacts of the row connected together, anormally locked spring controlled switch including four contact armsconnected together for moving in unison and normally engaging thecontacts of said row 'for normally closing a main line circuit for thesending of an alarm, a pair of main line circuit wires leading to two ofsaid arms and having interposed thereina repeater coil with one-halfgrounded, a pair of main line circuit wires leading from the other twoarms and having a repeater COll interposed therein-with one-ha1fgrounded, a

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of mum.

Washington, D. 0.

